Which is incorrect about purines?
A. Purines are found within nucleotides.
B. Purines include adenine and guanine.
C. Purines are always paired with a specific pyrimidine.
D. Purines are only found in DNA, not in RNA.
E. Purines are nitrogenous bases.
Answer: D
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How was the navigation ability of young loggerhead sea turtles studied by Kenneth Lohmann?
a. He placed radio transmitters on the shells of numerous hatchlings and tracked their migration patterns in the Atlantic ocean. b. He genetically engineered turtles so they lacked magnetoreceptors and then studied their behavior compared to a control group. c. He subjected turtles to an electromagnetic field opposite that of Earth's magnetic field, and then tracked the direction the hatchlings swam. d. The loggerhead turtles were injected with magnetite to see what impact it had on their navigation. e. Small magnets were glued to the hatchlings' shells, and their behaviors were monitored.
The study of the patterns in the distribution of plants and animals around the world is
a. diversity. b. biogeography. c. ecology. d. archaeology. e. environmentalism.
The main role of the large intestine is to ________.
A. produce bile, which helps the process of digestion B. break large food into smaller food bits C. absorb nutrients D. absorb water
What are the products of the replication of one DNA molecule?
A) four identical double-stranded DNA molecules B) a set of four sister chromatids C) a pair of homologous chromosomes D) two strands joined into one double-stranded DNA molecule E) two identical double-stranded DNA molecules